kernel/sched/autogroup.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _KERNEL_SCHED_AUTOGROUP_H
   3 #define _KERNEL_SCHED_AUTOGROUP_H
   4
   5 #ifdef CONFIG_SCHED_AUTOGROUP
   6
   7 struct autogroup {
   8         /*
   9          * Reference doesn't mean how many threads attach to this
  10          * autogroup now. It just stands for the number of tasks
  11          * which could use this autogroup.
  12          */
  13         struct kref             kref;
  14         struct task_group       *tg;
  15         struct rw_semaphore     lock;
  16         unsigned long           id;
  17         int                     nice;
  18 };
  19
  20 extern void autogroup_init(struct task_struct *init_task);
  21 extern void autogroup_free(struct task_group *tg);
  22
  23 static inline bool task_group_is_autogroup(struct task_group *tg)
  24 {
  25         return !!tg->autogroup;
  26 }
  27
  28 extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
  29
  30 static inline struct task_group *
  31 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  32 {
  33         extern unsigned int sysctl_sched_autogroup_enabled;
  34         int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
  35
  36         if (enabled && task_wants_autogroup(p, tg))
  37                 return p->signal->autogroup->tg;
  38
  39         return tg;
  40 }
  41
  42 extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
  43
  44 #else /* !CONFIG_SCHED_AUTOGROUP */
  45
  46 static inline void autogroup_init(struct task_struct *init_task) {  }
  47 static inline void autogroup_free(struct task_group *tg) { }
  48 static inline bool task_group_is_autogroup(struct task_group *tg)
  49 {
  50         return 0;
  51 }
  52
  53 static inline struct task_group *
  54 autogroup_task_group(struct task_struct *p, struct task_group *tg)
  55 {
  56         return tg;
  57 }
  58
  59 static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
  60 {
  61         return 0;
  62 }
  63
  64 #endif /* CONFIG_SCHED_AUTOGROUP */
  65
  66 #endif /* _KERNEL_SCHED_AUTOGROUP_H */